CODEWITHSUNDEEP
commandj2ssh
Raoul
Raoul

Reputation: 331

Executing multiple commands using j2ssh

I would like to know how to execute multiple commands using j2ssh. The code I got from the net is as follows:

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;

import com.sshtools.j2ssh.io.IOStreamConnector;
import com.sshtools.j2ssh.io.IOStreamConnectorState;
import com.sshtools.j2ssh.connection.*;

import com.sshtools.j2ssh.SshClient;

import com.sshtools.j2ssh.authentication.PasswordAuthenticationClient;
import com.sshtools.j2ssh.authentication.AuthenticationProtocolState;
import com.sshtools.j2ssh.session.SessionChannelClient;

import com.sshtools.j2ssh.configuration.SshConnectionProperties;

import com.sshtools.j2ssh.transport.ConsoleHostKeyVerification;

public class MySSHClient {

  SshClient ssh = null;
  SshConnectionProperties properties = null;
  SessionChannelClient session = null;

  public MySSHClient(String hostName, String userName, String passwd )
  {

    try
    {
      // Make a client connection
      ssh = new SshClient();
      properties = new SshConnectionProperties();
      properties.setHost(hostName);

      // Connect to the host
      ssh.connect(properties, new ConsoleHostKeyVerification());

      // Create a password authentication instance
      PasswordAuthenticationClient pwd = new PasswordAuthenticationClient();

      pwd.setUsername(userName);
      pwd.setPassword(passwd);

      // Try the authentication
      int result = ssh.authenticate(pwd);

      // Evaluate the result
      if (result==AuthenticationProtocolState.COMPLETE) {

        System.out.println("Connection Authenticated");
      }
    }
    catch(Exception e)
    {
      System.out.println("Exception : " + e.getMessage());
    }

  }//end of method.


  public String execCmd(String cmd)
  {
    String theOutput = "";
    try
    {
      // The connection is authenticated we can now do some real work!
      session = ssh.openSessionChannel();

      if ( session.executeCommand(cmd) )
      {
        IOStreamConnector output = new IOStreamConnector();
        java.io.ByteArrayOutputStream bos =  new
        java.io.ByteArrayOutputStream();
        output.connect(session.getInputStream(), bos );
        session.getState().waitForState(ChannelState.CHANNEL_CLOSED);
        theOutput = bos.toString();
      }
      //else
      //throw Exception("Failed to execute command : " + cmd);
      //System.out.println("Failed to execute command : " + cmd);
    }
    catch(Exception e)
    {
      System.out.println("Exception : " + e.getMessage());
    }

    return theOutput;
  }


}

I tried to go to a directory then list the files using the ls command but it didn't work

MySSHClient sshc = new MySSHClient(<hostName>, <userName>, <passwd>);
System.out.println( sshc.execCmd("cd test") );
System.out.println( sshc.execCmd("ls") );

Any help please?

Upvotes: 3

Views: 5336

Answers (3)

aleneox
aleneox

Reputation: 21

Instead of using executeCommand, try to write your commands in output stream - session.getOutputStream() with '\n' addition on the end. Then read input stream.

For example:

session.getOutputStream().write((command + "\n").getBytes());

Upvotes: 0

Philippe Blayo
Philippe Blayo

Reputation: 11030

Add the and operator (&&) between the commands:

System.out.println( sshc.execCmd("cd test && ls") );

&& is better than ; because if the cd fails the ls is not executed.

Upvotes: 0

Tim L
Tim L

Reputation: 1

Try separating commands by a semicolon. For example: System.out.println( sshc.execCmd("cd test; ls") );

Upvotes: 0

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